Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f819c6b11382491…

MALICIOUS

PDF

91.2 KB Created: 2021-03-23 17:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7a4972a35bf095a50be7b2f6c5d5be0 SHA-1: 21c1b67e635573456225a65edfdeef07115e8db7 SHA-256: 7f819c6b11382491131da2b1e599c2b5fef52e7ee4c4e2be9961831c76d3dd1e
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, specifically using an invoice template theme to entice users. The high-risk heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates a redirection to a malicious site, and the ML classifier strongly flags it as malicious. Although no scripts were extracted, the embedded URI points to a suspicious domain, likely serving as the initial stage of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/123?utm_term=excel+invoice+template+auto+numbering PDF link annotation
    • http://reduslim-shopofficial.site/36539809114q50h.pdfIn PDF document text
    • http://naturaleone.space/wenazobulisimufoluxwpog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5fce14dd93234.pdfIn PDF document text
    • http://koprovk.xyz/oracle_sql_aggregate_string_concatenationrvu2e.pdfIn PDF document text
    • http://pedrons.space/what_is_healthy_at_bojanglesnh34c.pdfIn PDF document text
    • http://selectgetc.top/is_solo_parent_leave_prorated7y7v1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_602e76eda6a97.pdfIn PDF document text
    • http://shop-you.xyz/sagurumanudv8oh0.pdfIn PDF document text
    • http://wersita.space/game_of_love_starlife_july_2020_full_episodey70ep.pdfIn PDF document text
    • http://skidki-day.store/dowojesufiwig5woas.pdfIn PDF document text
    • http://blubadgehelp.net/2003_ford_windstar_alternator_fuse_locationdwdkg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_602b6e4d95d12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jivala/arya_movie_music_ringtones.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/ladabubeterirefusebul.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/47897484747.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/glencore_plc_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/fabanamufowezedeveniwebid.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/hog_island_boa_care_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/formatter_php_array.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/assassination_franz_ferdinand_worksheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 5180 bytes
SHA-256: a41f96e01e91d7d9689ed924453fc49ed7743391d09a187eaef7b670c57117c4
font_02_sfnt_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 10188 bytes
SHA-256: 7b4a946ac9ee4b56b313771b1194c764d5796ad63c55f08ea9e0ff6ce9e31af0
font_03_sfnt_off00014e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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